使用 onStart 选项进行拖放

说明

当启动拖动时，将调用此回调函数。

语法

new Draggable('element', {onStart: 'effectFunction'});

此处的 effectFunction 是定义要应用的效果的函数。

示例

<html>
   <head>
      <title>Draggables Elements</title>
		
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      <script type = "text/javascript" src = "/javascript/scriptaculous.js"></script>
		
      <script type = "text/javascript">
         window.onload = function(){
            new Draggable(
               'myimage', { 
                  onStart : function(){
                     new Effect.Opacity('myimage', {from:0, to:1.0, duration:10});
                  }
               }
            );
         }
      </script>
   </head>

   <body>
      <p>When you start dragging it becomes disappear.</p>
      <img id = "myimage" src = "/images/scriptaculous.gif"/>
   </body>
</html>	

这将产生以下结果 −

scriptaculous_drag_drop.html